/*
 *  Copyright 2005 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.forum.forum;

import com.blandware.atleap.common.ForumModuleConstants;
import com.blandware.atleap.model.forum.Forum;
import com.blandware.atleap.search.SearchManager;
import com.blandware.atleap.service.forum.ForumManager;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.forum.ForumForm;
import com.blandware.atleap.webapp.util.core.CacheUtil;
import com.blandware.atleap.webapp.util.core.LinkedObjectsInfoContainer;
import com.blandware.atleap.webapp.util.core.WebappConstants;
import com.blandware.atleap.webapp.util.core.WebappUtil;
import org.apache.commons.validator.GenericValidator;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * <p>Deletes a forum.</p>
 * <p><a href="DeleteForumAction.java.html"><i>View source</i></a></p>
 *
 * @author Roman Puchkovskiy <a href="mailto:roman.puchkovskiy@blandware.com">
 *         &lt;roman.puchkovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.4 $ $Date: 2008/04/29 17:51:50 $
 * @struts.action path="/forum/forum/delete"
 * name="forumForm"
 * scope="request"
 * validate="false"
 * roles="forum-forum-delete"
 * @struts.action-forward name="listForums"
 * path="/forum/forum/list.do"
 * redirect="true"
 * @struts.action-forward name="viewLinkedObjects"
 * path="/core/linkedObjects/view.do"
 * @struts.action-forward name="unsatisfiable"
 * path="/forum/forum/list.do"
 */
public final class DeleteForumAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		ForumForm forumForm = (ForumForm) form;
		Long forumId;
		if ( !GenericValidator.isBlankOrNull(forumForm.getId()) ) {
            forumId = Long.valueOf(forumForm.getId());
		} else {
			if ( log.isWarnEnabled() ) {
				log.warn("Missing forum ID. Returning to list...");
			}
			return mapping.findForward("listForums");
		}

		ForumManager forumManager = (ForumManager) getBean(ForumModuleConstants.FORUM_MANAGER_BEAN);
		Forum forum = forumManager.retrieveForum(forumId);

		if ( forum == null ) {
			// forum not found. it might be deleted by someone else
			ActionMessages errors = new ActionMessages();
			errors.add("forumNotFound", new ActionMessage("forum.forum.errors.notFound"));
			saveErrors(request, errors);
			return mapping.findForward("listForums");
		}

        if ( !"true".equalsIgnoreCase(request.getParameter("force")) && forum.isInUse() ) {
            // trying to delete used forum - display warning
            String action = mapping.findForward("listForums").getPath();
            String redirectUrl = WebappUtil.getActionMappingURL(action, null, request, WebappConstants.URL_TYPE_DOMAIN_RELATIVE);
            ActionMessages messages = new ActionMessages();
            messages.add("deleteWarning", new ActionMessage("forum.forum.messages.deleteWarning"));
            saveMessages(request, messages);

            LinkedObjectsInfoContainer container = new LinkedObjectsInfoContainer();
            container.setRedirectUrl(redirectUrl);
            container.setDeleteAction(mapping.getPath());
            container.setObjectId(forum.getId());
            container.setObjectType(LinkedObjectsInfoContainer.TYPE_PAGE);
            request.getSession().setAttribute(WebappConstants.LINKED_OBJECTS_INFO_CONTAINER_KEY, container);

            saveToken(request);
            return mapping.findForward("viewLinkedObjects");
        }

        String uri = forum.getUri();
		forumManager.deleteForum(forumId);

		// unindex forum
		SearchManager searchManager = SearchManager.getInstance(request.getSession().getServletContext());
		searchManager.unIndexPage(uri, request);

		CacheUtil cacheUtil = CacheUtil.getInstance(request);
		cacheUtil.flushLocalizableFieldValueCache(forumId);

		return mapping.findForward("listForums");
	}
}
